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feat(ucs): interactive UCS icon with origin-snap grips, world-fixed compass

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The UCS icon now anchors to the projected UCS origin when it is on-screen
(falling back to the bottom-left corner), and becomes a selectable object:
hover highlights it, a click shows draggable grips, and dragging the origin
grip relocates the UCS while the X/Y tip grips rotate it. Drags snap to
geometry/grid through the existing snapper, and the new UCS is persisted on
release. The icon stays selectable while parked in the corner.

Also make the ViewCube compass (N/E/S/W) world-fixed: the cube body still
reorients with the active UCS, but the cardinals project through a camera-only
rotation and snap in world frame, so the directions no longer spin with the UCS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-27 01:12:45 +03:00
commit edcf24e324
10 changed files with 525 additions and 41 deletions
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15
src/app/view/mod.rs
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@ -215,18 +215,33 @@ impl OpenCADStudio {
None
} else if let Some((vp_cam, full)) = tab.scene.viewport_edit_frame((vw, vh)) {
let (_, ux, uy, uz) = tab.ucs_xform().axes();
let origin_screen = self.ucs_icon_at_origin.then(|| {
vp_cam
.project(tab.ucs_origin_world(), full)
.map(|p| iced::Point::new(full.x + p.x, full.y + p.y))
}).flatten();
Some(crate::ui::overlay::UcsIconParams {
view_proj: vp_cam.view_proj_rte(full),
bounds: full,
axes: (ux, uy, uz),
origin_screen,
hover: self.ucs_icon_hover,
selected: self.ucs_icon_selected,
})
} else if !is_paper {
let cam = tab.scene.camera.borrow();
let (_, ux, uy, uz) = tab.ucs_xform().axes();
let origin_screen = self.ucs_icon_at_origin.then(|| {
cam.project(tab.ucs_origin_world(), vp_bounds)
.map(|p| iced::Point::new(vp_bounds.x + p.x, vp_bounds.y + p.y))
}).flatten();
Some(crate::ui::overlay::UcsIconParams {
view_proj: cam.view_proj_rte(vp_bounds),
bounds: vp_bounds,
axes: (ux, uy, uz),
origin_screen,
hover: self.ucs_icon_hover,
selected: self.ucs_icon_selected,
})
} else {
None